In many law firms, no one senior owns marketing. The managing partner signs contracts, each vendor reports its own numbers, and renewals roll over because no one has the time to question them. A fractional CMO fills that seat part time. This guide explains what the role is, what it should cover, how it compares with an agency or an in-house hire, and how to tell whether your firm needs one. If you’re weighing agencies at the same time, read our guide on how to choose a law firm marketing agency.
What a fractional CMO is
A fractional CMO is a chief marketing officer you share: a senior marketing leader who works for your firm a fixed number of hours or days, owns the marketing plan and is accountable for its results. “Fractional” means part time and ongoing, not a one-off project.
The role sits between the partners and the vendors. Agencies, lead vendors, TV buyers and the website developer each report to it. It reports to the managing partner or the marketing committee.
What it is not:
- Not an agency account manager. An account manager runs your account at one vendor. A fractional CMO looks across all of them, including vendors it doesn’t run.
- Not a consultant who writes a plan and leaves. The role stays and answers for the plan.
- Not an intake manager. It measures intake, because intake decides how many leads become cases, but it doesn’t run your phones.
What the role should cover
A useful way to scope the role is by decision, not by task. Use this template to write the engagement down before it starts.
Free template: fractional CMO scope
Ten lines that define the role before it starts
| # | Area | What the fractional CMO owns | Your firm’s choice |
|---|---|---|---|
| 1 | Annual and quarterly plan | Written targets in signed cases by practice; budget by channel; tests to run | |
| 2 | Budget across channels | Search, Local Services, social, video, TV, radio, outdoor, sponsorships, lead vendors | |
| 3 | Vendor oversight | A scorecard per vendor on signed cases; renewal calendar; contract review for ownership and exit terms | |
| 4 | Measurement | One report across every channel, reconciled to the CRM, with the basis labeled | |
| 5 | Tests | Which channels to test, the design and the decision rule | |
| 6 | Forecast | A caseload forecast at low, middle and high, against intake capacity | |
| 7 | Intake link | Answer rate, speed to lead and sign rate tracked as marketing inputs | |
| 8 | Hiring help | Job descriptions and interviews for in-house marketing or intake roles | |
| 9 | Partner reporting | A quarterly review that opens with what isn’t working | |
| 10 | Cadence and limits | Hours or days a month; response time; what needs partner approval |
Two lines deserve extra care. Line 3: contract review here means marketing terms, such as who owns the accounts and how exit works. Legal terms are for your counsel. Line 10: set a spending authority. A common pattern is that the CMO can move budget between channels within a set band, and anything beyond needs a partner’s sign-off.
Agency, fractional CMO or in-house hire
The three options solve different problems. Many firms end up with two of them: an agency doing the work and someone senior judging it.
| Marketing agency | Fractional CMO | In-house marketing leader | |
|---|---|---|---|
| What it does | Runs campaigns in its channels | Owns the plan and judges every channel and vendor | Owns the plan, often manages staff and vendors |
| Time | Ongoing, by service | Part time, ongoing | Full time |
| Sees | Its own channels | Everything, on the same numbers | Everything |
| Conflict to watch | Grades its own work | May also run some channels; needs rules for that | Can be overruled or under-resourced |
| Cost basis | Fees by service (see what law firm marketing costs) | A flat monthly fee for a share of time | Salary plus benefits, recruiting and management time |
| Fits when | You know what to do and need it done | You need judgment across several vendors | Marketing is big enough for a full-time seat |
The in-house numbers. The U.S. Bureau of Labor Statistics puts the median annual wage for marketing managers at $166,790, and for advertising, promotions and marketing managers overall at $165,780, both for May 2025 (BLS). Pay is only part of the cost: in private industry, benefits average 30.0% of total employer compensation costs (BLS). At that average, a $166,790 salary implies roughly $238,000 a year in total compensation (our arithmetic, an estimate). Add recruiting time and the risk of a hire who doesn’t work out.
A fractional CMO costs a fraction of that for a fraction of the time. The trade is availability: you get senior judgment on a schedule, not a person down the hall.
Measurement oversight: the core of the job
The strongest reason to hire a fractional CMO is to have one set of numbers. Without one, each vendor reports what flatters it: the SEO firm shows rankings, the PPC agency shows platform conversions, the TV buyer shows impressions, and the lead vendor shows leads delivered. None of them adds up to the signed cases the partners care about.
A fractional CMO should insist on three things:
- Signed cases from the firm’s own CRM as the outcome for every channel, with cost per signed case labeled by basis. Our cost per signed case guide explains the bases and the 5-case rule.
- Attributed versus caused. A channel’s credited cases are not proof it caused them. Before raising a budget sharply on attribution alone, the role should propose a test (The Probative Standard).
- Fair tests for what clicks can’t see. TV, radio and billboards get no clicks. Geo tests, such as those built with Meta’s open-source GeoLift (GitHub), compare signed cases in areas where spend changed against matched areas where it didn’t. Our holdout test guide shows how to design one.
If the fractional CMO also runs some of your channels, ask how it handles grading its own work. A sound answer: every channel it manages shows its latest test result beside its cost per signed case, or the words “no test yet”.
Ethics: how a marketing leader can be paid
Model Rule 5.4 generally prohibits a lawyer or law firm from sharing legal fees with a nonlawyer, and bars a person who pays or recommends a lawyer from directing the lawyer’s professional judgment (ABA). States adopt their own versions, and they differ. For marketing roles, the practical rules are:
- Pay a flat fee or a salary. Not a percentage of fees, not a bonus per signed case, not a share of a settlement.
- Keep decisions about cases with lawyers. A marketing leader can measure which case types sign; which cases the firm takes is for the attorneys.
- Disclose vendor relationships. If the CMO earns a referral fee or commission from any vendor it recommends, you should know in writing.
Check your own state’s rule with your counsel before you sign any compensation arrangement that ties pay to results.
Signs it fits, and signs it doesn’t
It fits when:
- You have three or more marketing vendors and no one who adds up what they sign together.
- A renewal is coming and nobody can say what the current contract delivered.
- Partners argue about marketing from different numbers.
- You’re planning a new office, a new practice or a Spanish line, with no model of what it would take.
- Ad spend grows each year while intake staffing stays the same.
It doesn’t fit when:
- You have one channel that works and is measured on signed cases. You may need a good agency, not a CMO.
- You want someone to run campaigns hands-on day to day. That’s an agency or an in-house specialist.
- No one at the firm will meet the CMO regularly. The role depends on a partner who makes decisions.
Questions to ask before you hire one
Whoever you consider, ask these, and compare the answers side by side:
- What will you own, and what stays with the partners? Expect a clear line on budget authority and on decisions about cases.
- How will you measure every channel? The right answer starts with signed cases from your CRM, not platform reports.
- Do you run any channels yourself, or take vendor commissions? Either can be fine if disclosed. Ask how the conflict is handled.
- How much time is included, and how fast do you answer? Hours or days a month, and a response time for urgent questions.
- What will the first 90 days produce? Ask for a written list of deliverables.
- How are you paid? A flat fee. Walk away from any proposal tied to a share of legal fees.
- How do we end it? Notice period, what you keep, and how the plan and data are handed over.
The first 90 days
A good engagement starts with an inventory, not a new campaign.
| Period | What should happen |
|---|---|
| Weeks 1 to 2 | Every vendor, contract, account and renewal date listed, with who owns each account |
| Weeks 3 to 4 | Last year’s spend by channel and vendor set against signed cases from the CRM |
| Month 2 | Where the trail from first contact to signed case breaks, and the fixes |
| Month 3 | A written plan for the next quarter: budgets, tests, intake staffing and the partners’ decisions |
If, after two quarters, the partners still can’t say which channels sign cases and what each costs, the role isn’t working.
What Probative’s fractional CMO costs
Our fractional CMO is our founder, working with your firm every week. The price is flat and published, and from $100k a month of managed ad spend it’s included in every package:
The full menu and packages are on the pricing page, and the service itself is described on the fractional CMO page.
What this means for your firm
- Count your vendors and ask who judges them all on the same numbers. If no one does, that’s the gap.
- Write the scope down using the ten-line template before you hire anyone.
- Compare the real cost of an in-house hire, salary plus benefits, with the time you actually need.
- Pay a flat fee, never a share of fees or a price per case.
- Judge the role on signed cases, forecast accuracy and a written decision log.
Probative is AI-first SEO and ads for law firms. Whoever runs your channels, the measurement belongs to you: signed-case reporting and Independent Measurement put every vendor on one report from your own records. For building the budget the CMO will manage, see our law firm marketing budget guide.
Marketing information, not legal advice. Fee-sharing and compensation rules vary by state; check yours with your own counsel and your bar.